Centrifugal pulp-screen.



N0. 805,426. PATENTED NOV. 21. 1905. J. W. PAGKER.

CENTRIFUGAL PULP SCREEN.

APPLIOATION FILED OUT. 7, 1905.

3 SHEETS-SHEET l.

PATENTED NOV. 21, 1905.

J. W. PAOKBR. GENTRIFUGAL PULP SCREEN.

APPLICATION FILED OUT. 7, 1905.

3 SHEETS-SHBET 2.

No. 805,426. PATENTED NOV. 21, 1905. J. W. PAOKER.

CENTRIPUGAL PULP SCREEN.

APPLIOATION FILED OCT. 7, 1905.

3 SHEETS-SHEET 3.

Wz'cassasz fiu/erdor;

UNITED STATES PATENT OFFICE.

JAMES W. PACKER, OF GLENS FALLS, NEW YORK.

CENTRIFUGAL PULP-SCREEN.

Specification of Letters Patent;

Patented Nov. 21, 1905.

Original application filed May 20, 1905, Serial No. 261,337. Divided and this application filed October 7, 1905. Serial No. 281,772.

To ctZZ whom it may concern:

Be it known that I, JAMES W. PAcKnR, aciti- Zen of the United States, residing at Glens Falls, Warren county, New York, have in vented certain new and useful Improvements in Centrifugal Pulp-Screens; and I dohereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

My invention relates to certain new and useful improvements in centrifugal pulpstrainers, and is designed for the screening of pulp for paper-stock and for analogous uses.

This application is a division of my pending application, Serial No. 261,337, filed May 20, 1905.

In the accompanying drawings, Figure 1 illustrates a central vertical section and partial elevation of a pulp-strainer embodying my invention. Fig. 2 represents a top plan view thereof; and Fig. 3 represents a top plan view on the line 2 2 of Fig. l, but with the cover and the parts supported thereby removed.

Similar letters of reference indicate similar parts throughout the several views.

Referring to the drawings, A indicates a foundation-casting having a central projection a, to which is bolted, by suitable flanges, the oil-well Z of the stepped bearing for the operating-shaft of the apparatus. This oilwell 6 likewise serves as a means of attachment for the stationary sun-gear 0, which is conveniently made in two parts, clamped together by means of the lugs cZand suitable bolts and nuts. Within the well Z2 is arranged the step 6 with its supporting-plates, and the well is closed byacover f, havingan inwardlydepending annular flange, suitably perforated for the reception of the wicking g for conveying oil into the space between the said annular flange and the shaft B. Lubricating-oil may conveniently be supplied to the well 5 from a pipe 7t, communicating with the'feedpipe 2', having a sight-gage at f, and which may be filled from the receptacle 7c.

The shaft B has keyed upon it the hub C, which is extended outwardly to form the annular inclined surface 0 and the depending annular flange C At the outer periphery of this revolving element are located a number of revoluble shafts Z, hearing at their lower ends the gears n, which engage with gears t, intermeshing with the stationary sungear 0, so that as the shaft B revolves the pinions n and their shafts Z will revolve upon their own axes in an opposite direction of rotation to the direction of rotation of the shaft B. At their upper ends the shafts Z carry the hubs m, keyed or otherwise secured thereto, and these hubs are provided with spider-arms wt, preferably dished or concaved on their upper edges for a purpose hereinafter to be described. At the outer ends of the spider-arms the casting is provided with a rim m and a supplemental rim 172. which latter incloses a ledge, upon which the cylindrical screens are removably mounted by any suitable meanssuch as, for instance, the bolts and nuts shown. The screens supported by the several shafts Z consist of cylindrical screen-plates D, having perforations of the desired gage, a bottom plate (4, provided with a central aperture for the escape of the knots or tailings, and a cover-plate a provided with an aperture, within which extends the supplyspout for the unscreened pulp. The bearings for the shafts Z may be conveniently lubricated from the gutter Z and its side channels, the uptake-pipe c for supplying the lubricating-oil to the said gutter being either branched from the oil-pipe Z or receiving its supply from a pipe similar to pipe 2'. Branch lubricating-pipes 0 supply lubricating material to the shafts of the intermediate gears 2,.

The inlet-spouts E are branched from a central hub secured to the hub (land consequently rotate with the shaft. At their outlet ends the spouts E are bent or inclined rearwardly with respect to the direction of rotation of the individual screens D. Moreover, this inclination of the discharge ends of the spouts E is such that the unscreened pulp on entering the several screens is discharged upon the screen surface in advance of the plane in which the centrifugal force developed attains its maximum. Consequently the pulp as it moves toward this plane of greatest centrifugal effect is subjected to a constantly-increasing centrifugal action instead of to a diminishing centrifugal action, which'would be the case were the pulp to be discharged directly in the plane of greatest centrifugal effect. In practice this is of vital importance to the successful operation of the apparatus, as otherwise the pulp has a tendency to roll up into balls or round lumps in which the good and waste fiber are entangled in such manner that proper screening cannot be efiected.

The knots or other impurities constituting the tailings pass downwardly through the openings in the bottoms a of the individual screens D and are directed by the cover G into the annular trough F, having an inclined bottom which directs them outward tangentially through the opening Gr. The trough F is formed within a casting H, resting upon the base-casting A, and a spray-pipe 8, provided with a spraying-nozzle 3, serves to direct" water upon the inclined trough F, so as to prevent the accumulation of material thereon.

Above the casting H are the castings I and J, which together make up an annular trough for conducting the screened pulp to the point of discharge K. The casting I has an inclined bottom to facilitate the ready discharge of the pulp in the direction of the outlet K. Above the casting J and removably bolted thereto is the cover L, provided with a handhole plate M, closing a corresponding aperture through which the individual screens D may be readily removed when it is desired so to do, either for purposes of repair or for substituting other screens of a different gage. The concave upper edges of the spider-arms m facilitate the taking out and insertion of the screens by providing sufficient leeway for that purpose. The cover L likewise supports the bracket N, within which the driving-shaft O and its fast and loose pulleys P Q are moun ted, and also supports the stationary inlet-pipe R and its supply-nipple S, as well as the upper bearing T for the shaft B. The shaft B is driven from the miter-gears U V, as shown, or in any other suitable manner.

As the knots or other solid impurities are detached and thrown inwardly by centrifugal force, a portion of the attached mass strikes the rear surface of those portions of the spouts E, which project into the individual screens and tends to adhere to the spouts. In order to prevent this adhesion and accumulation of knots and other solid impurities upon the spouts, a stream or streams of Water is admitted through a pipe or pipes .2 in such manner as to strike the exterior surfaces of the spouts during their revolution, thereby keeping the said exterior surfaces covered with a film of water. By this expedient the material that would otherwise adhere to the spouts drops down through the open bottom of the individual screens.

The mode of operation of the invention will be apparent. The unscreened wood-pulp or other paper-stock is supplied from any suitable source through the nipple S and pipe R to the rotating spouts E while the shaft B is in rotation. The unscreened pulp issuing from the spouts E in advance of the plane of greatest centrifugal action strikes the inner periphery of the several'screens D and is subjected to a constantly-increasing centrifugal action until it reaches the plane of maximum centrifugal action, whereupon the centrifugal action again diminishes. The pulp, deprived of its knots and other objectionable solid impurities, passes through the screens, and the knots and impurities are carried around until they reach a point opposite the screeningpoint, whereupon they are gradually subjected to a centrifugal force which tends to detach them from the screen-surface and to project them into the interior of the screens, so that they fall through the open bottoms of the screens and into the discharge-trough F, from which they are conducted to any desired point of collection. The screened pulp as it passes through the screens is conducted by its collecting-trough to the point of discharge K.

-I-Iaving thus described my invention, what I claim, and desire to secure by Letters Patent, is

1. In a strainer for paper-pulp and the like, an individual screen having an unobstructed inner screening-surface, means for rotating said individual screen upon its own axis, means for rotating said individual screen simultaneously about an axis exterior thereto, and a supply-spout for delivering the unscreened stock to the interior of the screen at a point in advance of the plane of greatest centrifugal action; substantially as described.

2. In a strainer for paper-pulp and the like, a central shaft, a series of individual screens having unobstructed inner screening-surfaces mounted upon and revolving with said shaft, means for revolving each of the series of individual screens upon its own axis, and supply-spouts entering the several screens and discharging upon their inner surfaces at points in advance of the planes of greatestcentrifugal action; substantially as described.

3. In a strainer for paper-pulp and the like, a central shaft, a series of individual screens having unobstructed inner screening-surfaces mounted upon and revolving with said shaft, means for revolving each of the series of individual screens upon its own axis, supplyspouts entering the several screens and discharging upon their inner surfaces at points in advance of the planes of greatest centrifugal action, and means for directing upon the exterior of said spouts a stream of water; substantially as described.

4. In a strainer for paper-pulp and the like, an individual screen having an unobstructed inner screening-surface, means for rotating said individual screen upon its own axis, means for rotating said individual screen simultaneously about an axis exterior thereto, and a supply-spout entering the screen and d ischarging at a point in advance of the plane of greatest centrifugal action; substantially as described.

5. In a strainer for paper-pulp and the like, an individual screen having an unobstructed inner screening-surface, means for rotating the said individual screen upon its own axis,

In testimony whereof I afliX my signature in presence of two Witnesses.

JAMES W. PACKER.

Witnesses:

OSCAR K. (Rose, RICHARD C. TEFFT. 

